Computers in cars

I know this is WAY off topic, I was hopeing I wasnt the only one who like to drive fast, and know everything a car is pushing, I was just kinda wondering if anybody on here has a laptop with some kind of dyno program installed in a car, or even how to begin interfacing a laptop with a cars computer to get torque, horsepower, and those kind of results

Hi jkay. I moved this onto the main forum. It's a very legitimate computer question.
The only in-car s/w I have seen for a laptop, has been diagnostic.
You can get free s/w for that.
The cheapest interface would, I think, cost around $50-$100 (but you have to build it yourself)

I have seen some free software for it, but nothing to set it up, I wouldnt mind building it myself, I've done everything to my car from installing audio equipment to putting custom headers on it, anyone mind posting links to some possibilites?

@Lighthouse, Well I think a lot of them would still apply, the "souping up" is usually done to the mechanical aspect of the vehicle, well at least for cars, trucks you can "tune" the computer to put out more torque than horsepower, things like that. I would say for the most part the cars computer doesnt get touched, unless your taking the car so far it's no longer street legal.